Possessive form of the noum porcupines

The possessive form for porcupines would be porcupine's. Since a possessive noun is a noun that shows ownership, there should always be an apostrophe s ('s) in any words such as porcupine.

It depends on whether you want the possessive form of porcupine (singular) or porcupines (plural) because there is a difference.

1. singular porcupine: just add an apostrophe followed by - s: porcupine's

2. plural porcupines: just add an apostrophe (not followed by - s) : porcupines'